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Red Brass and SS 304 corrosion?

Red Brass and SS 304 corrosion?

Red Brass and SS 304 corrosion?

On a 304 stainless steel pipe with water running through it, a drain valve made of red brass was installed to the ss304 pipe drain, will these two dissimilar metals cause corrosion?

It appears there may be a risk for galvanic corrosion risk, from one source, voltage differences of 0.2 Volts or more suggest a galvanic corrosion risk, between red brass and 304 stainless steel, there is a difference of 0.18 to 0.35.
a. red brass (-0.31 to -0.4)
b. stainless steel (-0.05 to -0.13)

thanks for any help!

RE: Red Brass and SS 304 corrosion?

What water? The lower the conductivity the less the risk. Nist if the charts are for seawater.
Is this really old school red brass 85Cu 5Zn 5Sn 5Pb?
Dealloying the biggest risk but with only 5% Sm it shouldn't be a big issue.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Red Brass and SS 304 corrosion?

Need to replace the red brass drain valve with one made of SS 304. Everything else has been said by Sir Ed.


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